1 #ifndef _LINUX_USER_NAMESPACE_H
2 #define _LINUX_USER_NAMESPACE_H
4 #include <linux/kref.h>
5 #include <linux/nsproxy.h>
6 #include <linux/ns_common.h>
7 #include <linux/sched.h>
10 #define UID_GID_MAP_MAX_EXTENTS 5
12 struct uid_gid_map
{ /* 64 bytes -- 1 cache line */
14 struct uid_gid_extent
{
18 } extent
[UID_GID_MAP_MAX_EXTENTS
];
21 struct user_namespace
{
22 struct uid_gid_map uid_map
;
23 struct uid_gid_map gid_map
;
24 struct uid_gid_map projid_map
;
26 struct user_namespace
*parent
;
32 /* Register of per-UID persistent keyrings for this namespace */
33 #ifdef CONFIG_PERSISTENT_KEYRINGS
34 struct key
*persistent_keyring_register
;
35 struct rw_semaphore persistent_keyring_register_sem
;
39 extern struct user_namespace init_user_ns
;
43 static inline struct user_namespace
*get_user_ns(struct user_namespace
*ns
)
46 atomic_inc(&ns
->count
);
50 extern int create_user_ns(struct cred
*new);
51 extern int unshare_userns(unsigned long unshare_flags
, struct cred
**new_cred
);
52 extern void free_user_ns(struct user_namespace
*ns
);
54 static inline void put_user_ns(struct user_namespace
*ns
)
56 if (ns
&& atomic_dec_and_test(&ns
->count
))
60 struct seq_operations
;
61 extern const struct seq_operations proc_uid_seq_operations
;
62 extern const struct seq_operations proc_gid_seq_operations
;
63 extern const struct seq_operations proc_projid_seq_operations
;
64 extern ssize_t
proc_uid_map_write(struct file
*, const char __user
*, size_t, loff_t
*);
65 extern ssize_t
proc_gid_map_write(struct file
*, const char __user
*, size_t, loff_t
*);
66 extern ssize_t
proc_projid_map_write(struct file
*, const char __user
*, size_t, loff_t
*);
69 static inline struct user_namespace
*get_user_ns(struct user_namespace
*ns
)
74 static inline int create_user_ns(struct cred
*new)
79 static inline int unshare_userns(unsigned long unshare_flags
,
80 struct cred
**new_cred
)
82 if (unshare_flags
& CLONE_NEWUSER
)
87 static inline void put_user_ns(struct user_namespace
*ns
)
93 #endif /* _LINUX_USER_H */